I've read it is possible to switch a DX7 to a Mode 3 by starting off with the Mode 1 version. You have to swap the 4 sets of 3 wires that go to the Aileron and rudder gimbal pots and trims. This is the best way to do it according to Paul Beard. I opened the back of my Mode 1 DX7 and I only see what I think are the 2 set of wires for the trim controls. I think there is suppose to be another set for the gimbal pots but im not quite sure where they would be. I attached a picture of the wires im talking about. Im guessing these are only for the trims. Where would the gimbal pot wires be? Do I have to take apart anything else to get to them? Im hoping someone who has knowledge in this particular area could help me out. Thanks for any help on this.

One of the guys on Runryder who did the switch told me he only switched the bottom two wire sets I have circled. Sounds weird to me cuz it only looks like you would swap the trim assignments. He said his is working fine after 100 flights. The only drawback is that the trim adjustments are reversed. Oh well I'll start with thosse and see what happens.

I think the wires you have circled are opposite ends of the same wires. It looks like there is a small PCB on the back of the trim switch, and that the Red/Blue/Black and Yellow/Blue/Black wires go from the trim switchs to the gimble pots. It looks like there are four or five wires from the trim switch PCB that run to the main PCB (see red oval). I'll bet these are the wires that need to be swapped.

Ok guys I unsoldered then swapped the two sets of wires at the bottom. To me it seemed easier to do it this way then do a cable swap. The cables would of needed to be cut then extended b/c they were to short to extend to the other side. Anyway thats all I did tonight. Pretty nerve racking experience for me considering Im not the most graceful soldering tech... I didnt try to bind anything yet but I did go into the servo travel/centering screen and sure enough the right stick when moved left & right is moving the rudder channel and left stick aileron. My trim settings are going to be on the opposite side but I think I can live with this. I got this far I dont want to push my luck.

My centers are a little off so I will go into the service menu and recenter everything. Thanks for the comments. So much for my warranty

I've got a similar problem--bought DX7 from a guy here at the forums, but he hasn't mentioned (intentionally?) that the transmitter is Mode 1...

I've figured out how to swap the wires, but, at the end, found that the throttle potentiometer has lower resistance range than the other pots. The ADC accounts for that, interpreting smaller changes of the throttle pot as bigger changes of the throttle channel level. As a result, swapping the wires without moving the pots around makes the elevator travel about +-120%, while the throttle travel is reduced to roughly +-80%!

the pots should all have the same value... 5K. Does the throttle stick (original) have a reduced travel range ? If its not equal to the other stick, you may be fitted with limiters on the throttle stick. These are 2 small plastic wedges fitted in the stick base.

The logic tells that they should, but nobody prevents JR/Spektrum from defying the logic!

Quote:

Originally Posted by mac_man

Does the throttle stick (original) have a reduced travel range ? If its not equal to the other stick, you may be fitted with limiters on the throttle stick. These are 2 small plastic wedges fitted in the stick base.

I will carefully look at this.

What makes me believe that the two pots are different is that, after I swapped wires between the throttle and the elevator pots, I see the following channel travels, measured using MileHighWings 10-bit precision interface (all channel's end points are set to 100%):
Throttle: +-80%
Aileron: +-100%
Elevator: +-120%
Rudder: +-100%
If only the throttle stick were mechanically limited, then this would only affect one channels.

I will try to measure the resistance of both pots, if I can get access to them (I will, as I/m going to mechanically swap them).